Understanding Matter and Solutions

Particles in solid matter

• vibrate in place.

• spread apart.

• remain motionless.

• flow over each other.

Answer explanation

In solid matter, particles are closely packed and can only vibrate in place due to strong intermolecular forces. They do not spread apart, remain motionless, or flow over each other, making 'vibrate in place' the correct choice.

Which of the following is true of a liquid?

• Volume is fixed, and shape is fixed

• Volume is not fixed, and shape is fixed

• Volume in fixed, and shape is not fixed

• Volume in not fixed, and shape is not fixed

Answer explanation

A liquid has a fixed volume but takes the shape of its container, meaning its shape is not fixed. Therefore, the correct statement is that volume is fixed, and shape is not fixed.

Not all matter

• is easy to see.

• has weight.

• takes up space.

• is made of particles.

Answer explanation

Not all matter is easy to see, as some forms, like gases or certain particles, are invisible to the naked eye. However, all matter has weight, takes up space, and is made of particles.

What happens to a material if it dissolves in water?

• particles disappear forever

• particles become a solid

• particles mix with water

• particles become vapor

Answer explanation

When a material dissolves in water, its particles disperse and mix with the water, forming a solution. This means the particles do not disappear or become solid or vapor; they simply become evenly distributed in the liquid.

In a sugar water solution, a drop of sugar water from the top has_____ a drop from the bottom.

• less sugar than

• the same sugar as

• more sugar than

• much more sugar than

Answer explanation

In a sugar water solution, the concentration of sugar is typically higher at the top due to less mixing with the denser solution below. Therefore, a drop from the top has more sugar than a drop from the bottom.

What happens if you boil a sugar water solution?

• water turns into vapor, and sugar turns into vapor

• water becomes a solid, and sugar turn into vapor

• water becomes a solid, and sugar becomes a solid

• water turns to vapor, and sugar becomes a solid

Answer explanation

When boiling a sugar water solution, the water evaporates as vapor, while the sugar, which has a higher boiling point, remains and crystallizes into a solid form.

A blown up balloon weighs___________ an empty balloon.

• less than

• much less than

• the same as

• more than

Answer explanation

A blown-up balloon contains air, making it heavier than an empty balloon. Therefore, the correct answer is 'more than' as the inflated balloon's weight increases due to the added air.

_____________ is possible because air is made of particles

• A bounce house having a shape

• A leaf blowing in the wind

• Breath pushing a feather away

• all of the above

Answer explanation

All options demonstrate how air, composed of particles, interacts with objects. A bounce house maintains shape due to air pressure, leaves move with air currents, and breath can push a feather, confirming that all are possible due to air's particle nature.

How do odor particles move across a room?

• in a straight line

• in random directions

• very quickly

• no movement at all

Answer explanation

Odor particles move in random directions due to their kinetic energy and collisions with air molecules. This randomness allows them to disperse throughout a room, making the correct answer 'in random directions'.

You cannot feel the weight of air because it ________.

• is always around us

• doesn’t weigh anything

• is make out of particles

• it does not take up space

Answer explanation

The correct answer is 'doesn’t weigh anything' because air is composed of particles that are too light to be felt individually. While air has mass, it is not perceptible to us in the same way as heavier objects.